A strain gauge is a small sensor whose resistance changes depending on the strain experienced by the structure it is attached to. Designed for steel structures, this strain gauge comes in the half-bridge configuration.

They are similar to Load Cells, but are useful for applications where the structure has already been built. For example, you could use a strain gauge and a 1046 – PhidgetBridge 4-Input to measure the strain on various segments of the chassis of a robot or vehicle.